This is a question that is on the Police Numeracy Assessment.

I don't understand it and neither does the MOTH, who is usually very good at these things. I do the spelling and he does the maths.

He did actually get the right answer but then couldn't explain how he got it and the more he explained the more confused we both got and eventually he conceded that he got it right by mistake.

Here is the question:

"5/3 is to 1/5 what 5 is to what?"

If anyone could explain how to work this out we would both be very grateful.